| A | B |
| monogamous | (adj.) has ONE partner or husband/wife |
| monogram | (n.) your initials sewn on your bag or towel |
| monolingual | (adj.) only uses one language |
| monopoly | (n.) only one company makes that kind of thing |
| monorail | (n.) train that rides on only one rail |
| monotonous | (adj.) boring; only one "same-same" thing going on |
| bifocals | (n.) glasses with a line, to see two types of things |
| bilingual | (adj.) uses two languages |
| biped | (n.) animal that moves on two feet |
| binoculars | (n.) two lenses, connected, for seeing far away |